US20220230777A1 - Resin coated superconducting wire, superconducting coil, and shield coil - Google Patents

Resin coated superconducting wire, superconducting coil, and shield coil Download PDF

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US20220230777A1
US20220230777A1 US17/615,236 US202017615236A US2022230777A1 US 20220230777 A1 US20220230777 A1 US 20220230777A1 US 202017615236 A US202017615236 A US 202017615236A US 2022230777 A1 US2022230777 A1 US 2022230777A1
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Prior art keywords
superconducting wire
resin
resin coated
coated superconducting
wire according
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US17/615,236
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English (en)
Inventor
Hiroyuki Fukushima
Yonghoon Kim
Hideki II
Takumi Sato
Hirokazu Tsubouchi
Masahiro Sugimoto
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Furukawa Electric Co Ltd
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Furukawa Electric Co Ltd
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Assigned to FURUKAWA ELECTRIC CO., LTD. reassignment FURUKAWA ELECTRIC CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FUKUSHIMA, HIROYUKI, II, Hideki, KIM, YONGHOON, SATO, TAKUMI, SUGIMOTO, MASAHIRO, TSUBOUCHI, HIROKAZU
Publication of US20220230777A1 publication Critical patent/US20220230777A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/303—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups H01B3/38 or H01B3/302
    • H01B3/305—Polyamides or polyesteramides
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
    • H01B12/02—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by their form
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/307—Other macromolecular compounds
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/02—Disposition of insulation
    • H01B7/0208—Cables with several layers of insulating material
    • H01B7/0216—Two layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F6/00—Superconducting magnets; Superconducting coils
    • H01F6/06—Coils, e.g. winding, insulating, terminating or casing arrangements therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment

Definitions

  • the present disclosure relates to a resin coated superconducting wire, a superconducting coil, and a shield coil.
  • a superconducting material is used as a shield coil in applications, such as nuclear magnetic resonance (NMR) systems and systems for magnetic resonance imaging (MRI) inspection.
  • NMR nuclear magnetic resonance
  • MRI magnetic resonance imaging
  • the shield coil is used to shield the magnetic field applied from outside to inside so that proper analysis results are obtained, and is used to shield the magnetic field applied from inside to outside so that the human body and the electronic equipment are protected from the effect of the magnetic field.
  • such a superconducting material is, for example, a resin coated superconducting wire 2 including a superconducting wire 22 such as a NbTi wire, a copper stabilizer 21 called a copper channel coating the superconducting wire 22 , and a braided resin 23 such as polyester around the copper stabilizer 21 .
  • a resin coated superconducting wire 2 by coating the superconducting wire 22 with the copper stabilizer 21 , the heat generated from the superconducting wire 22 is released to the outside to suppress an increase in temperature, for example, with immersing the resin coated superconducting wire 2 into a liquid helium.
  • the present disclosure has been provided in view of the circumstances mentioned above, and it is an object of the present disclosure to provide a resin coated superconducting wire that is lightweight, highly flexible, and inexpensive as compared to conventional ones.
  • thermoplastic resin has a melting point of 290° C. or less.
  • thermoplastic resin has a melting point of 210° C. or less.
  • the inner matrix resin layer includes an olefin-based resin having at least one functional group selected from the group consisting of an epoxy group, an oxazolyl group, an amino group, and a maleic anhydride residue, or includes a copolymer of the olefin-based resin.
  • the present disclosure makes it possible to provide a resin coated superconducting wire that is lightweight, highly flexible, and inexpensive as compared to conventional ones.
  • FIG. 2 is a transverse cross sectional view of a resin coated superconducting wire (circular) according to an embodiment of the present disclosure.
  • FIG. 3 is a transverse cross sectional view of a resin coated superconducting wire (rectangular) according to an embodiment of the present disclosure.
  • FIG. 4 is a transverse cross sectional view of a resin coated superconducting wire (circular) according to an embodiment of the present disclosure.
  • FIGS. 5A to 5F are transverse cross sectional views showing different modifications of a resin coated superconducting wire (rectangular).
  • FIG. 6 is a transverse cross sectional view of a conventional resin coated superconducting wire.
  • the present inventors have completed the present disclosure based on findings that designing a resin coated superconducting wire including a matrix resin including a synthetic resin material, and a superconducting wire in the matrix resin, in which, in a transverse cross section of the resin coated superconducting wire, a cross section area of the matrix resin is equal to or larger than that of the superconducting wire makes it possible to provide a resin coated superconducting wire that is lightweight, highly flexible, and inexpensive as compared to a conventional resin coated superconducting wire.
  • the resin coated superconducting wire according to the present disclosure includes a matrix resin including a synthetic resin material, and a superconducting wire in the matrix resin.
  • a cross section area of the matrix resin is equal to or larger than the cross section area of the superconducting wire.
  • FIG. 1 is a transverse cross sectional view of a resin coated superconducting wire according to an embodiment of the present disclosure
  • FIG. 2 is a transverse cross sectional view of a resin coated superconducting wire according to another embodiment of the present disclosure
  • the resin coated superconducting wire 1 includes a matrix resin 11 including a synthetic resin material, and a superconducting wire 12 in the matrix resin 11 .
  • the cross section area of the matrix resin 11 is equal to or larger than the cross section area of the superconducting wire 12 .
  • the resin coated superconducting wires 1 shown in FIGS. 1 to 2 are each a monolayer coated wire in which the matrix resin 11 includes a single matrix resin layer covering the outer circumference of the superconducting wire 12 .
  • the resin coated superconducting wire 1 should be coiled such that adjacent portions of the coiled superconducting wire 12 are apart from each other at a constant distance.
  • the superconducting wire 12 is provided to extend (preferably embedded) in the matrix resin 11 having the transverse cross section area equal to or larger than the transverse cross section area of the superconducting wire 12 .
  • This feature allows the matrix resin 11 to serve as what is called a spacer in the resin coated superconducting wire, so that the superconducting wire 12 can be coiled with its adjacent portions kept apart from each other at a constant distance.
  • the matrix resin 11 includes a synthetic resin material.
  • the matrix resin 11 provides reliable insulation between portions of the superconducting wire 12 and serves as what is called a spacer as mentioned above so that adjacent portions of the superconducting wire 12 can be kept apart from each other at a constant distance. It should be noted that the matrix resin is solid, which is intended to exclude fiber knitting.
  • the matrix resin 11 is preferably a thermoplastic resin which can be subjected to extrusion molding.
  • the extrusion molding is an effective method for forming a thick coating such that the cross section area of the matrix resin 11 is equal to or larger than that of the superconducting wire 12 in the transverse cross section of the resin coated superconducting wire 1 .
  • the matrix resin 11 is more preferably a polyamide or a polyolefin.
  • the polyamide is preferably nylon.
  • the thermoplastic resin is preferably, for example, polyethylene, polypropylene, polystyrene, nylon 11, nylon 12, nylon 6, nylon 66, nylon 610, nylon MXD6 (a polycondensate of m-xylylenediamine and adipic acid), polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyphenylene sulfide, tetrafluoroethylene-hexafluoropropylene copolymer resin (FEP), tetrafluoroethylene-ethylene copolymer resin (ETFE), polycarbonate, polyphenylene ether, polyetherimide, or polyether sulfone. These resins may be used alone, or a mixture of two or more of these resins may be used.
  • the synthetic resin material included in the matrix resin 11 is not only that the matrix resin 11 consists of a synthetic resin material but also that the matrix resin 11 is a resin composition based on a synthetic resin material.
  • a resin composition may contain various additives for use in common resin compositions, such as various fillers, antioxidants, and other additives for improving mechanical or chemical durability.
  • the matrix resin 11 may contain a filler so that the matrix resin 11 has a lower heat shrinkage percentage close to the heat shrinkage percentage of the superconducting wire 12 and thus the resin coated superconducting wire 1 has increased heat cycle resistance.
  • the matrix resin 11 When the matrix resin 11 is a crystalline resin, the matrix resin 11 preferably has a melting point of, for example, 290° C. or less, more preferably 280° C. or less, even more preferably 270° C. or less.
  • the matrix resin 11 is produced by thermoforming a raw material, the raw material with a lower melting point can be molded at a lower temperature, and thus the superconducting wire 12 can be prevented from suffering from performance degradation due to heating during the molding.
  • the crystalline resin which may constitute the matrix resin 11 , is preferably, for example, polyethylene, polypropylene, nylon 11, nylon 12, nylon 6, nylon 66, nylon 610, nylon MXD6, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyphenylene sulfide, tetrafluoroethylene-hexafluoropropylene copolymer resin (FEP), or tetrafluoroethylene-ethylene copolymer resin (ETFE).
  • FEP tetrafluoroethylene-
  • the matrix resin 11 preferably has a melting point of 210° C. or less, more preferably 200° C. or less, even more preferably 190° C. or less.
  • the crystalline resins for forming the matrix resin 11 polyethylene, polypropylene, nylon 11, and nylon 12 are preferred.
  • the matrix resin 11 is preferably nylon or a polyolefin.
  • the matrix resin 11 is more preferably nylon 11, nylon 12, nylon 6, nylon 66, nylon 610, nylon MXD6, polyethylene, or polypropylene, and even more preferably nylon 11, nylon 12, polyethylene, or polypropylene since they have particularly low melting points, low heat shrinkage percentages, excellent water absorption resistance (low water absorption rates), excellent flexibility, and excellent mechanical properties.
  • the synthetic resin material of the matrix resin 11 preferably has a glass transition point of, for example, 250° C. or less, more preferably 240° C. or less, even more preferably 230° C. or less.
  • the lower glass transition point of the raw material allows the resin coating and molding process to be performed at a lower temperature, so that changes in the performance of the superconducting wire 12 due to heating during the thermoforming can be prevented.
  • the amorphous resin, which may constitute the matrix resin 11 is preferably, for example, polycarbonate, polyphenylene ether, polyetherimide, or polyether sulfone.
  • FIG. 3 is a transverse cross sectional view of another resin coated superconducting wire (rectangular), and FIG. 4 is a transverse cross sectional view of a further resin coated superconducting wire (circular).
  • the resin coated superconducting wires 1 shown in FIGS. 3 and 4 are each a multilayer coated wire including a superconducting wire 12 , and a matrix resin 11 including multiple matrix resin layers and covering the outer circumference of the superconducting wire 12 .
  • the matrix resin 11 shown in FIGS. 3 and 4 differs from the matrix resin 11 shown in FIGS. 1 and 2 in that the matrix resin 11 shown in FIGS.
  • FIGS. 3 and 4 includes an annular inner matrix resin layer 11 a covering the outer circumference of the superconducting wire 12 , and at least one outer matrix resin layer 11 b covering the outer circumference of the inner matrix resin layer 11 a .
  • FIGS. 3 to 4 show that the matrix resin 11 has a two-layer structure composed of a single inner matrix resin layer 11 a and a single outer matrix resin layer 11 b.
  • the resin coated superconducting wire 1 is preferably a multilayer coated wire having two or more matrix resin layers, such as the inner matrix resin layer 11 a and the outer matrix resin layer 11 b , and is more preferably a multilayer coated wire having two or more and four or less matrix resin layers.
  • the resin coated superconducting wire 1 is produced in the form of a multilayer coated wire, the resin may be used in a smaller amount per single extrusion coating process, so that the resulting extrusion coated wire is expected to have a higher dimensional accuracy.
  • different resins may be used to form the respective matrix resin layers, so that the resin coated superconducting wire 1 can have higher functionality.
  • the inner matrix resin layer 11 a when the matrix resin includes a polyolefin resin, such as polyethylene or polypropylene, which has low adhesion to the superconducting wire 12 , the inner matrix resin layer 11 a , which is the first layer from the conductor side, may include an olefin-based resin having at least one functional group selected from the group consisting of an epoxy group, an oxazolyl group, an amino group, and a maleic anhydride residue, or include a copolymer of the olefin-based resin (also referred to as copolymer (A)).
  • the inner matrix resin layer 11 a enhances the adhesion between the superconducting wire 12 and the outer polyolefin resin 11 b .
  • the inner matrix resin layer 11 a may include an olefin-based copolymer containing a carboxylic acid metal salt (also referred to as olefin-based copolymer (B)).
  • the inner matrix resin layer 11 a is also expected to enhance the adhesion as mentioned above.
  • the olefin component used to form the copolymer (A) is preferably ethylene, propylene, butene-1, pentene-1, 4-methylpentene-1, isobutylene, hexene-1, decene-1, octene-1, 1,4-hexadiene, or dicyclopentadiene, and more preferably ethylene, propylene, or butene-1. These components may be used alone, or two or more of these components may be used.
  • the copolymer component used other than the olefin to form the copolymer (A) may be at least one component of an acrylic component and a vinyl component.
  • the acrylic component is preferably acrylic acid, methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, tert-butyl acrylate, isobutyl acrylate, methyl methacrylate, ethyl methacrylate, or butyl methacrylate.
  • the vinyl component is preferably vinyl acetate, vinyl propionate, vinyl butyrate, vinyl chloride, vinyl alcohol, or styrene. Among them, methyl acrylate and methyl methacrylate are more preferred. These components may be used alone, or two or more of these components may be used.
  • Typical preferred examples of the copolymer (A) include maleic anhydride-grafted polyethylene or polypropylene, ethylene-glycidyl methacrylate copolymers, and commercially available resins such as Admer (trade name, manufactured by Mitsui Chemicals, Inc.), Bond Fast (trade name, manufactured by Sumitomo Chemical Co., Ltd.), and Lotader (trade name, manufactured by Atofina).
  • Admer trade name, manufactured by Mitsui Chemicals, Inc.
  • Bond Fast trade name, manufactured by Sumitomo Chemical Co., Ltd.
  • Lotader trade name, manufactured by Atofina
  • Preferred examples of the carboxylic acid used to form the olefin-based copolymer (B) include unsaturated monocarboxylic acids such as acrylic acid, methacrylic acid, and crotonic acid, and unsaturated dicarboxylic acids such as maleic acid, fumaric acid, and phthalic acid.
  • Examples of the metal salt include Zn salts, Na salts, K salts, and Mg salts.
  • the olefin-based copolymer (B) is preferably a resin generally called an ionomer, such as Himilan (trade mane, manufactured by Mitsui Polychemicals), in which some parts of the carboxylic acid in the ethylene-methacrylic acid copolymer is a metal salt.
  • the matrix resin 11 preferably has a heat shrinkage percentage of 5° or less, more preferably 2° or less, even more preferably 1% or less as calculated using the method shown below. This feature makes the matrix resin 11 less vulnerable to damage or degradation when the matrix resin 11 is immersed in a cooling medium such as liquid helium.
  • the resin coated superconducting wire 1 is cut along the longitudinal direction of the resin coated superconducting wire 1 into 0.2 g pieces, each of which is immersed in 500 mL liquid helium for several minutes and then measured for size.
  • the heat shrinkage percentage of the resin coated superconducting wire 1 is calculated from the formula (1) below.
  • Heat shrinkage percentage (%) ⁇ (the size of the resin coated superconducting wire before the immersion ⁇ the size of the resin coated superconducting wire after the immersion)/the size of the resin coated superconducting wire before the immersion ⁇ 100 Formula (1)
  • the matrix resin 11 more preferably has a water absorption rate of 1.0% or less, even more preferably 0.7% or less as calculated using the method shown below.
  • the lower the water absorption rate the less likely the surface of the matrix resin 11 is to expand. This feature makes the matrix resin 11 less vulnerable to a reduction in mechanical strength, which is caused by damage, degradation, deterioration, or cracking that occurs when the matrix resin 11 absorbs water.
  • the calculation method shown below is one of the methods for determining the water absorption rate of plastics according to JIS K 7209.
  • the resin coated superconducting wire 1 is cut along the longitudinal direction of the resin coated superconducting wire 1 into 1.0 g pieces, each of which is immersed in 500 mL water at 23° C. for 24 hours, then wiped to remove water from the surface, and then measured for weight.
  • the water absorption rate of the resin coated superconducting wire 1 is calculated from the formula (2) below.
  • Water absorption rate (%) ⁇ (the weight of the resin coated superconducting wire before the immersion ⁇ the weight of the resin coated superconducting wire after the immersion)/the weight of the resin coated superconducting wire before the immersion ⁇ 100 Formula (2)
  • the superconducting wire 12 is a wire in the matrix resin 11 described above and has superconducting property.
  • the size of the transverse cross section of the superconducting wire 12 when the transverse cross section is a circular shape, the size is preferably 0.05 to 2.00 mm ⁇ , more preferably 0.07 to 1.50 mm ⁇ , even more preferably 0.1 to 1.0 mm ⁇ .
  • the transverse cross section of the superconducting wire 12 is a rectangular shape, the long side of the rectangular shape is preferably 0.8 mm to 2.5 mm, more preferably 1.5 mm to 2.0 mm, and the short side of the rectangular shape is preferably 0.5 mm to 1.5 mm, more preferably 0.9 mm to 1.2 mm.
  • the superconducting wire 12 preferably includes, for example, at least one superconducting material selected from the group consisting of a composite of metal and niobium-titanium, a composite of metal and niobium-3 tin (Nb 3 Sn), a composite of metal and magnesium diboride, a rare earth-based superconducting material, and a bismuth-based superconducting material.
  • the composite of metal and niobium-titanium, the composite of metal and niobium-3 tin, or the composite of metal and magnesium diboride refer to a composite in which the metal such as copper or iron covers the surrounding of the niobium-titanium, the niobium-3 tin, or the magnesium diboride.
  • Examples of the rare earth-based material include YBa 2 Cu 3 O 7- ⁇ and GdBa 2 Cu 3 O 7- ⁇ .
  • Examples of the bismuth-based material include Bi 2 Sr 2 Ca 2 Cu 3 O 10+ ⁇ and Bi 2 Sr 2 CaCu 2 O 8+ ⁇ .
  • the superconducting wire 12 may be a single wire or a stranded wire including multiple strands twisted together.
  • the cross section area of the matrix resin 11 is equal to or larger than the cross section area of the superconducting wire 12 .
  • the ratio of the cross section area of the matrix resin 11 to the cross section area of the superconducting wire 12 is preferably 2 or more, more preferably 5 or more, even more preferably 10 or more, further more preferably 20 or more, most preferably 40 or more.
  • the ratio of the cross section area preferably has an upper limit of 1000 from practical points of view such as coil material suitability and handleability for coiling operation.
  • FIGS. 1 and 2 show a case in which the superconducting wire 12 is located at the center (gravity center) of the matrix resin 11 in the transverse cross section of the resin coated superconducting wire 1 .
  • the superconducting wire 12 may be located at any position in the matrix resin 11 as long as the superconducting wire 12 remains not exposed from the surface of the resin coated superconducting wire 1 (as long as at least a small amount of the resin component of the matrix resin 11 is present over the surface of the resin coated superconducting wire 1 ).
  • 5A to 5F show modified examples illustrating the transverse cross sections of the resin coated superconducting wires 1 A to 1 F, which have a rectangular cross section and respectively include the superconducting wires 12 A to 12 F located at different positions in the transverse cross sections of the matrix resins 11 A to 11 F.
  • the resin coated superconducting wire has one superconducting wire 12 in the form of a single wire or a stranded wire, which is located in one matrix resin 11 .
  • the resin coated superconducting wire may have any transverse cross section shape such as a circular shape including an elliptic shape, a triangular shape, a square shape, or a rectangular shape.
  • the resin coated superconducting wire preferably has a rectangular transverse cross section shape.
  • the transverse cross section of the resin coated superconducting wire is a rectangular shape
  • the rectangular transverse cross section shape of the resin coated superconducting wire may have a round corner or corners with an R value of 1 mm or less.
  • the transverse cross section of the resin coated superconducting wire preferably has a long side of, for example, 0.5 mm to 10 mm, more preferably 1 mm to 7 mm.
  • the transverse cross section of the resin coated superconducting wire preferably has a short side of, for example, 0.1 mm to 5 mm, more preferably 0.5 mm to 3 mm.
  • the resin coated superconducting wire preferably has a dimensional accuracy of ⁇ 0.10 mm or less in width and a dimensional accuracy of ⁇ 0.10 mm or less in thickness, and more preferably has a dimensional accuracy of ⁇ 0.05 mm or less in width and a dimensional accuracy of ⁇ 0.05 mm or less in thickness.
  • the dimensional accuracy refers to the range of difference between the maximum and minimum of a dimension of a piece of the resin coated superconducting wire.
  • the resin coated superconducting wire with such a dimensional accuracy as mentioned above provides higher electromagnetic shielding performance.
  • Such a dimensional accuracy may be achieved by a method of cutting the outer surface of a product resulting from resin extrusion process.
  • such a dimensional accuracy may be achieved by a method of coating the surface of the matrix resin with, for example, a UV-curable resin material.
  • the resin coated superconducting wire described above may be used to form a superconducting coil, specifically, a shield coil for use in NMR systems and MRI inspection systems.
  • the voltage is preferably 0 to 50 V, more preferably 0 to 20 V, even more preferably 0 to 10 V.
  • the resin coated superconducting wire is lightweight, inexpensive, improved in flexibility, and less likely to have a bending habit, and is easy to coil because it has high flexibility or bendability and good handleability.
  • the resin coated superconducting wire according to the embodiment described above may be produced, for example, using an extrusion process similar to a common process for forming an extruded resin material, which inserts a superconducting wire into a synthetic resin raw material for forming a matrix resin and then extrudes the raw material.
  • the heating temperature, the extrusion rate, and other conditions may be appropriately adjusted depending on the kind of the synthetic resin raw material and the size and shape of the product to be formed.
  • a conventional technique includes two steps including covering a superconducting strand with a resin and then embedding the strand in a copper channel.
  • the resin coated superconducting wire according to the embodiment can be completed using a single step instead of the conventional two steps because the matrix resin can be shaped into the same form as that of the copper channel.
  • the synthetic resin raw materials used were nylon 11 (BESN Noir TN manufactured by Arkema), nylon 12 (UBESTA 3030LUX manufactured by Ube Industries, Ltd.), nylon 6 (UBESTA 1024JI manufactured by Ube Industries, Ltd.), nylon 66 (Leona® 1300S manufactured by Asahi Kasei Corporation), and high-density polyethylene (Suntech®-HD B891 manufactured by Asahi Kasei Corporation).
  • a superconducting wire with 0.3 mm ⁇ of a composite of copper and niobium-titanium was inserted into the synthetic resin raw material and then subjected to an extrusion process at a temperature equal to or more than a temperature that is obtained by adding the melting point of each resin raw material and 20° C.
  • Examples 1 to 20 a rectangular product
  • Examples 21 to 40 a circular product having the dimensions shown in Table 2 or 3 below.
  • the superconducting wire was placed at the center of the synthetic resin material.
  • a resin coated superconducting wire having a rectangular transverse cross section was produced in each of Examples 1 to 20.
  • a resin coated superconducting wire having a circular transverse cross section was produced in each of Examples 21 to 40.
  • the synthetic resin raw material used was high-density polyethylene (Suntech®-HD B891 manufactured by Asahi Kasei Corporation).
  • a resin coated superconducting wire was obtained as in Example 41 except that a superconducting wire with 0.3 mm ⁇ of a composite of copper and niobium-titanium coated with 20 ⁇ m-thick ethylene-methacrylic acid copolymer in which some parts of the carboxylic acid was a metal salt (Himilan 1855 manufactured by Mitsui Polychemicals) was used instead.
  • the synthetic resin raw material used was high-density polyethylene (Suntech®-HD B891 manufactured by Asahi Kasei Corporation).
  • the cross section area of the matrix resin was calculated by determining, in the transverse cross section of the resin coated superconducting wire, the cross section area of the resin coated superconducting wire from the external dimensions of the resin coated superconducting wire and then subtracting the cross section area of the superconducting wire from the determined cross section area.
  • the calculated cross section area of the matrix resin was used to calculate the weight and cost of the resin per 1000 m length of the resin coated superconducting wire and the cost relative to those of copper. The results are shown in Tables 2 to 5 below. In Tables 2 to 5, the parenthesized values indicate the values calculated in terms of copper.
  • Table 1 shows the melting point, the glass transition point, the heat shrinkage percentage, and the water absorption rate of each of the synthetic resin materials used in Examples 1 to 43.
  • the heat shrinkage percentage and the water absorption rate were determined by the methods described above.
  • Tables 2 to 5 also show that the resin coated superconducting wires of Examples 1 to 43 can attain a significantly reduced weight and a reduced material cost as compared to copper coated superconducting wire.

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
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US17/615,236 2019-05-31 2020-05-29 Resin coated superconducting wire, superconducting coil, and shield coil Pending US20220230777A1 (en)

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JP2019-103286 2019-05-31
JP2019103286 2019-05-31
PCT/JP2020/021496 WO2020241893A1 (ja) 2019-05-31 2020-05-29 樹脂被覆超電導線、超電導コイルおよびシールドコイル

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US (1) US20220230777A1 (enrdf_load_stackoverflow)
EP (1) EP3979264A4 (enrdf_load_stackoverflow)
JP (2) JP7704676B2 (enrdf_load_stackoverflow)
KR (1) KR102847529B1 (enrdf_load_stackoverflow)
CN (1) CN113950725A (enrdf_load_stackoverflow)
WO (1) WO2020241893A1 (enrdf_load_stackoverflow)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3310398A (en) * 1964-08-14 1967-03-21 Nat Res Corp Electrical materials and devices
US3527873A (en) * 1968-12-27 1970-09-08 Atomic Energy Commission Composite superconducting cable having a porous matrix
US3743986A (en) * 1972-02-08 1973-07-03 Atomic Energy Commission Improved resistive envelope for a multifilament superconductor wire
US4409425A (en) * 1980-12-22 1983-10-11 Siemens Aktiengesellschaft Cryogenically stabilized superconductor in cable form for large currents and alternating field stresses
EP0602647A1 (en) * 1992-12-18 1994-06-22 Hitachi, Ltd. Superconducting magnet, superconducting magnet coil, and manufacturing method thereof
US20020153162A1 (en) * 2000-12-27 2002-10-24 Sergio Spreafico Superconducting cable
US20080163474A1 (en) * 2007-01-09 2008-07-10 Seung Hong Soldered superconductor with hard insulation
US20160307663A1 (en) * 2013-12-26 2016-10-20 Furukawa Electric Co., Ltd. Insulated wire, coil, and electric/electronic equipments as well as method of producing a film delamination-resistant insulated wire
CN206179576U (zh) * 2016-09-30 2017-05-17 无锡友方电工股份有限公司 高温超导绞线
US20170243681A1 (en) * 2014-09-01 2017-08-24 Luvata Espoo Oy A Metal Assembly Comprising a Superconductor

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49105885U (enrdf_load_stackoverflow) * 1972-12-29 1974-09-11
JPS50114772U (enrdf_load_stackoverflow) * 1974-02-27 1975-09-18
JPS5229071U (enrdf_load_stackoverflow) * 1975-08-20 1977-03-01
JPS56137605A (en) * 1980-03-31 1981-10-27 Toshiba Corp Superelectroconductive coil
JPS63121215A (ja) * 1986-11-07 1988-05-25 住友電気工業株式会社 超電導線及びその製造方法
JPH01195616A (ja) * 1988-01-29 1989-08-07 Fujikura Ltd 酸化物系長尺超電導材の製造方法
JPH0459169U (enrdf_load_stackoverflow) * 1990-09-28 1992-05-21
JP3451401B2 (ja) * 1992-12-16 2003-09-29 鐘淵化学工業株式会社 超電導線材被覆用熱融着性積層フィルム
JPH07142282A (ja) * 1993-11-18 1995-06-02 Nitto Boseki Co Ltd コイル巻線の固定方法及び巻芯
JP5367248B2 (ja) * 2007-10-04 2013-12-11 古河電気工業株式会社 多層絶縁電線
JP2013020727A (ja) * 2011-07-07 2013-01-31 Nitto Denko Corp 平角電線用被覆材、被覆平角電線及び電気機器
JP6133249B2 (ja) * 2014-09-09 2017-05-24 古河電気工業株式会社 絶縁電線、コイルおよび電気・電子機器ならびに絶縁電線の製造方法

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3310398A (en) * 1964-08-14 1967-03-21 Nat Res Corp Electrical materials and devices
US3527873A (en) * 1968-12-27 1970-09-08 Atomic Energy Commission Composite superconducting cable having a porous matrix
US3743986A (en) * 1972-02-08 1973-07-03 Atomic Energy Commission Improved resistive envelope for a multifilament superconductor wire
US4409425A (en) * 1980-12-22 1983-10-11 Siemens Aktiengesellschaft Cryogenically stabilized superconductor in cable form for large currents and alternating field stresses
EP0602647A1 (en) * 1992-12-18 1994-06-22 Hitachi, Ltd. Superconducting magnet, superconducting magnet coil, and manufacturing method thereof
US20020153162A1 (en) * 2000-12-27 2002-10-24 Sergio Spreafico Superconducting cable
US20080163474A1 (en) * 2007-01-09 2008-07-10 Seung Hong Soldered superconductor with hard insulation
US20160307663A1 (en) * 2013-12-26 2016-10-20 Furukawa Electric Co., Ltd. Insulated wire, coil, and electric/electronic equipments as well as method of producing a film delamination-resistant insulated wire
US20170243681A1 (en) * 2014-09-01 2017-08-24 Luvata Espoo Oy A Metal Assembly Comprising a Superconductor
CN206179576U (zh) * 2016-09-30 2017-05-17 无锡友方电工股份有限公司 高温超导绞线

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